1.0 library + player settings: Jellyfin/Link/Files library with details panel, player gear, settings cards, host flag

Library: source switch, selectable cards with a details panel, one merged
Continue row, Latest grouped per series without re-releases, Link page with
previews and recent links, Files embedded. Player: gear popover in both
designs, progress line while controls hide, live hwdec. Settings rebuilt as
cards. State marks the host member (proto stays 9, unreleased); hosting
shows LAN invite addresses; window buttons in fullscreen. fadeThrough keeps
the outgoing view's state.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/controls/controls_probe.dart

@@ -0,0 +1,58 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+/// Follows whether media_kit's desktop controls around [child] are up,
+/// by the same rule they use: up on mount and on any mouse movement,
+/// down [hideAfter] later or when the mouse leaves. media_kit does not
+/// expose its visibility; this lets the player draw a progress line while
+/// they are down. Never takes input.
+class ControlsHoverProbe extends StatefulWidget {
+  final ValueNotifier<bool> shown;
+  final Duration hideAfter;
+  final Widget child;
+  const ControlsHoverProbe({super.key, required this.shown, required this.hideAfter, required this.child});
+
+  @override
+  State<ControlsHoverProbe> createState() => _ControlsHoverProbeState();
+}
+
+class _ControlsHoverProbeState extends State<ControlsHoverProbe> {
+  Timer? _timer;
+
+  @override
+  void initState() {
+    super.initState();
+    // Not during this build: the line listening to [shown] may be built.
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (mounted) _wake();
+    });
+  }
+
+  @override
+  void dispose() {
+    _timer?.cancel();
+    super.dispose();
+  }
+
+  void _wake() {
+    widget.shown.value = true;
+    _timer?.cancel();
+    _timer = Timer(widget.hideAfter, _hide);
+  }
+
+  void _hide() {
+    _timer?.cancel();
+    if (mounted) widget.shown.value = false;
+  }
+
+  @override
+  Widget build(BuildContext context) => MouseRegion(
+        opaque: false,
+        hitTestBehavior: HitTestBehavior.translucent,
+        onEnter: (_) => _wake(),
+        onHover: (_) => _wake(),
+        onExit: (_) => _hide(),
+        child: widget.child,
+      );
+}